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Finding the Fourth Proportional to 124,920.80, 187,381.20 and 72,465.20

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Solution

The fourth proportional to 124,920.80, 187,381.20 and 72,465.20 is: 108,697.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    124,920.80 : 187,381.20 = 72,465.20 : x
  2. Step 2: Convert to fraction form
    124,920.80/187,381.20 = 72,465.20/x
  3. Step 3: Cross multiply
    124,920.80x = 187,381.20 × 72,465.20
  4. Step 4: Simplify right side
    124,920.80x = 13,578,616,134.24
  5. Step 5: Solve for x
    x = 13,578,616,134.24/124,920.80
  6. Step 6: Final answer
    x = 108,697.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.